Desert Plants. by Kate Herenger. HOUGHTON MIFFLIN HarcOUrt

Transcription

1 Desert Plants by Kate Herenger HOUGHTON MIFFLIN HarcOUrt

2 Desert Plants by Kate Herenger ILLUSTRATION CREDIT: 5 Scott MacNeill PHOTOGRAPHY CREDITS: Alamy; 1 Alamy; 2 Steven Poe/Alamy; 3 Alamy; 7 Alamy; 8 Dan Suzio/Photo Researchers, Inc.; 9 Alamy; 10 Robert Shantz/Alamy; 11 Kip Evans/Alamy; 13 George H.H. Huey/Alamy; 14 Dan Suzio/Photo Researchers, Inc. Copyright by Houghton Mifflin Harcourt Publishing Company All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage and retrieval system, without the prior written permission of the copyright owner unless such copying is expressly permitted by federal copyright law. Requests for permission to make copies of any part of the work should be addressed to Houghton Mifflin Harcourt Publishing Company, Attn: Contracts, Copyrights, and Licensing, 9400 South Park Center Loop, Orlando, Florida Printed in the U.S.A. ISBN: XXXX A B C D E F G If you have received these materials as examination copies free of charge, Houghton Mifflin Harcourt Publishing Company retains title to the materials and they may not be resold. Resale of examination copies is strictly prohibited. Possession of this publication in print format does not entitle users to convert this publication, or any portion of it, into electronic format.

3 A Plant Called Cactus The desert is a hot, dry place. It gets very little rain. Plants need water to live. How do plants survive in the desert? Only some kinds of plants can grow in a desert environment. These plants have adapted to the hot temperatures and lack of rain. The most common desert plant is the cactus. Take one look and you can tell a cactus is not like other plants. For one thing, it usually has no leaves! There s a good reason for that. 2

4 Many types of cactus grow in the desert. 3

5 Finding Water and Food Water evaporates easily through a plant s leaves. That means the water goes out into the air instead of staying in the plant. Without leaves, a cactus can keep more water inside it. Leaves help most plants get their nutrition. Leaves make food from sunlight, air, water, and minerals. Since a cactus often has no leaves, its stem and outer surface do the job of making food. A cactus is unlike other plants in another way. It has short roots. Why? A cactus s short roots are close to the surface of the ground. That means they can soak up rain almost as soon as it falls. The faster, the better! 4

6 outer surface stem roots 5

7 Surviving in the Desert After the cactus s roots absorb water, they can store it for a long time. The cactus stem can store water too. The stem has a waxy skin, or outer layer. That also helps hold water in. When you think about it, a cactus is almost like a large, prickly water bottle. A cactus can survive for years from the water it collects in just one rainfall! That s a useful skill in the desert. Many kinds of cactus have sharp spines. How does being prickly help a cactus survive? Spines help absorb water when it rains. They also give the cactus some shade from the hot desert sun. Most importantly, spines protect the cactus from hungry desert animals. Animals may think the cactus looks tasty. They will have a hard time taking a bite out of it, though! 6

8 Prickly spines help protect the cactus. 7

9 Trees have special ways to survive in the desert. Desert Trees The cactus may be the most famous desert plant, but it is not the only one. Trees grow in the desert too. Unlike a cactus, a desert tree has long roots. Why? Long roots help desert trees reach water that is deep underground. One type of desert tree has roots that are up to 80 feet long! 8

10 Desert Bushes Bushes grow in the desert too. Some of them have adapted to the hot, dry environment even better than the cactus or desert trees. What is their secret? Some desert bushes have short roots, like a cactus. They also have very long roots, like a desert tree! That means they can soak up new rainfall as well as water deep underground. Desert bushes come in many shapes and sizes. 9

11 One type of desert bush has a special way to protect itself from hungry animals. It doesn t have spines, like a cactus. Instead it has a very bad smell! Some animals ignore the smell and bite into the bush. Then they get a surprise. The bush has a very bad taste, too! Animals have two reasons to stay away from this desert bush. 10

12 Many desert plants survive by becoming dormant. Waiting for Rain Other desert plants have their own special ways to survive. Some plants become dormant during long periods without rain. Being dormant is a lot like hibernating. That s what bears do in the winter. 11

13 After the Rain When desert plants are dormant, they don t need to take in water or make food. They rest and save energy. Then, when the rain comes again, the plants wake up! Some kinds of desert plants grow and die very quickly. In the spring, when there is just the right amount of sunshine and rainfall, these plants suddenly sprout up from the sandy desert soil. The small shoots appear and then blossom in only a few days time. The plants are not large, but they are colorful. Their beautiful flowers brighten and soften the desert landscape. 12

14 In spring, the desert comes alive with color. 13

15 Bats and bees visit the flowers. They carry away grains of pollen. These creatures will spread some of the pollen to other flowers. That will help the flowers make seeds. After the flowers fade, seed pods appear. Seeds drop from the pods, or the wind picks them up and blows them across the desert. Meanwhile, the small plants die as quickly as they appeared. Some of them live only a few weeks! Soon, though, many new, amazing desert plants will grow! Animals and insects help desert plants spread and grow. 14

16 Responding TARGET SKILL Text and Graphic Features What do the photos in this book show you about desert plants? Copy the chart. List a photo from the book. List what the photo shows you about the desert. Photo Page What it Shows cactus page 7 many spines Write About It Text to World What else would you like to know about the desert? Use an encyclopedia or other source to research more about it. Then write a paragraph that includes the facts you learn. 15

17 TARGET VOCABULARY grain nutrition pod root shoot soak soften tasty ExPAND Your VocabulARY adapted dormant evaporates landscape surface survive TARGET SKILL Text and Graphic Features Tell how words go with photos. TARGET STRATEGY Monitor/Clarify Find ways to figure out what doesn t make sense. GENRE Informational text gives facts about a topic. 16

18 Level: N DRA: 30 Genre: Informational Text Strategy: Monitor/Clarify Skill: Text and Graphic Features Word Count: Houghton Mifflin Online Leveled Books